CN108356447A - G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire and preparation method thereof - Google Patents
G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire and preparation method thereof Download PDFInfo
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- CN108356447A CN108356447A CN201810218619.8A CN201810218619A CN108356447A CN 108356447 A CN108356447 A CN 108356447A CN 201810218619 A CN201810218619 A CN 201810218619A CN 108356447 A CN108356447 A CN 108356447A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
Abstract
The invention discloses G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire, including medicine core and weldering skin, wherein medicine core it is composed of the following components by mass percentage：Ferrosilicon powder 1%~4%, manganese powder 3%~5%, chromium powder 15%~20%, nickel powder 12%~16%, copper powder 7%~9%, ferro-niobium powder 2%~5%, golden red mountain flour 8%~13%, Fluorspar Powder 13%~15%, zircon flour 6%~10%, lithium carbonate powder 4%~8%, brown iron oxide 3%~5%, alumina powder 3%~5%, magnesia powder 4%~5%, remaining is iron powder, and the sum of the above components mass percent is 100%.Flux-cored wire prepared by the present invention has the advantages that spatter is few, appearance of weld is beautiful, good welds processing performance compared with rust steel electrode and solid welding wire；It can be used for continuous wire feed automatic welder and preparation method be simple, it is easy to operate, it can be used for mass production.
Description
Technical field
The invention belongs to welding material and preparation method thereof technical fields, and in particular to G520 stainless steels and
25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire, the invention further relates to the preparation methods of the flux-cored wire.
Background technology
In recent years, use of the large fan in China's industry is increasingly extensive, and applying working condition also becomes increasingly complex, to improve
The total quality of wind turbine, it is desirable that the blade material at wind turbine core position has the good resultant forces such as higher obdurability and hardness
Learn performance.G520 stainless steels be a kind of novel precipitation hardening of martensitic for being developed on the basis of FV520B type martensitic stain less steels not
Become rusty steel, has higher intensity, good welding performance, heat resistance, corrosion resistance are natural gas centrifugal compressor impellers
Common used material.This kind of stainless steel has unstable austenite structure after quenching.It can in plastic history or
Martensite being generated after cold treatment, precipitation-hardening then being generated by timeliness, the martensite of phase transformation is made further to strengthen.Its chemistry
In ingredient, ω (Cr) ensure that the corrosion resistance of steel 13% or more.It can make steel that there is metastable Austria after solution treatment containing Ni
Family name's body tissue.The alloying elements such as Cr, Ni, Mn, Mo, Al are added in cooperation, make the control of M points at -78 DEG C~25 DEG C, Mo, Al, Ti,
Compound and certain a small amount of carbide generate precipitation-hardening between the precipitating metals such as Nb, Cu.In addition such carbon content of steel is low, ω (C)
0.04%~0.13%, therefore corrosion resisting property is fine.
25Cr2Ni4MoV steel alloys are low-alloy structural steel, wider in the position application of wind turbine core, for example are turned in wind turbine
Application on son, ingredient are C：0.22%~0.27%, Si：0.15%~0.35%, Mn：≤ 0.35%, P：≤ 0.015,
S：≤ 0.018, Ni：3.25%~4.00%, Cr：1.50%~2.00%, Mo：0.20%~0.50%, V：0.05%~
0.13%, Cu：≤ 0.20%.And 25Cr2Ni4MoV steel alloys are widely used in national defence due to its good obdurability
And machinery industry important part etc..
By welding together both steel, the service life of draught fan impeller can be greatlyd improve.Currently, being closed about with G520
Jin Gang and 25Cr2Ni4MoV stainless steel dissimilar Welding Problems only have a small amount of welding procedure in terms of report, there is not yet molten about it
Weld the report of Self-protecting flux-cored wire.
Invention content
The object of the present invention is to provide G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting medicine core to weld
Silk, the flux-cored wire splash less in the welding process, and appearance of weld is beautiful, has good welding technological properties.
It is a further object to provide G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting medicine
The preparation method of core welding wire.
The technical solution adopted in the present invention is G520 stainless steels and 25Cr2Ni4MoV steel alloy welding Self-protectings
Flux-cored wire, including medicine core and weldering skin, wherein medicine core is composed of the following components by mass percentage：Ferrosilicon powder 1%~4%, manganese
Powder 3%~5%, chromium powder 15%~20%, nickel powder 12%~16%, copper powder 7%~9%, ferro-niobium powder 2%~5%, golden red mountain flour
8%~13%, Fluorspar Powder 13%~15%, zircon flour 6%~10%, lithium carbonate powder 4%~8%, brown iron oxide 3%~
5%, alumina powder 3%~5%, magnesia powder 4%~5%, remaining is iron powder, and the sum of the above components mass percent is
100%.
The features of the present invention also characterized in that
Weldering skin is cold-rolled low carbon steel steel band.
The loading of medicine core powder is 15wt%~20wt% in flux-cored wire.
Another technical solution of the present invention is that G520 stainless steels and the welding of 25Cr2Ni4MoV steel alloys are with certainly
The preparation method of protection type flux-cored wire, is as follows：
Step 1 weighs respectively by mass percentage：Ferrosilicon powder 1%~4%, manganese powder 3%~5%, chromium powder 15%~
20%, nickel powder 12%~16%, copper powder 7%~9%, ferro-niobium powder 2%~5%, golden red mountain flour 8%~13%, Fluorspar Powder 13%
~15%, zircon flour 6%~10%, lithium carbonate powder 4%~8%, brown iron oxide 3%~5%, alumina powder 3%~5%,
Magnesia powder 4%~5%, remaining is iron powder, and the sum of the above components mass percent is 100%；
Step 2, the lithium carbonate powder that step 1 is weighed, brown iron oxide, alumina powder and magnesia powder mixing, are mixed
Sodium silicate binder is added into mixed powder A and is uniformly mixed, is then placed into heating furnace and is sintered, pulverize, mistake by medicinal powder A
Sieve, obtains mixed powder B；
Step 3, the ferrosilicon powder for weighing step 1, manganese powder, chromium powder, nickel powder, copper powder, ferro-niobium powder, golden red mountain flour, Fluorspar Powder,
Zircon flour and iron powder are uniformly mixed, and obtain mixed powder C, the mixed powder B that step 2 obtains is mixed with mixed powder C
It is even, it is placed in drying oven and dries, obtain medicine core powder；
Step 4, by flux-cored wire producing machine the medicine core powder that step 3 obtains be wrapped in weldering it is intradermal, and using molding
Machine will weld skin and be closed, and obtain flux-cored wire semi-finished product, will weld skin wiped clean with acetone, and then carry out first of drawing procedure,
2.8mm is in the grinding tool aperture that first of drawing procedure uses；
After step 5, first of drawing procedure, reduces drawing grinding tool aperture and carry out postorder drawing, until flux-cored wire
A diameter of 1.2mm~1.6mm；
After step 6, flux-cored wire drawing, the greasy dirt on flux-cored wire surface is removed with the cotton for being moistened with acetone, is obtained
G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire.
The features of the present invention also characterized in that
The mass ratio of mixed powder A and sodium silicate binder is 5 in step 2:1.
Sintering temperature is 650 DEG C~750 DEG C in step 2, and sintering time is 4~6h, and sieving granularity is 60~140 mesh.
Drying temperature is 200 DEG C~300 DEG C in step 3, and drying time is 2h~3h.
Weldering skin in step 4 is cold-rolled low carbon steel steel band, and the width of steel band is 7mm, thickness 0.3mm.
The loading of medicine core powder is 15wt%~20wt% in flux-cored wire in step 4.
The invention has the advantages that
(1) G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire of the present invention, with stainless steel
Welding rod is compared with solid welding wire, is had the advantages that spatter is few, appearance of weld is beautiful, good welds processing performance, be can be used for
Continuous wire feed automatic welder, has higher production efficiency and saving and protection gas；
(2) G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire of the present invention, utilizes mineral
Slag system generates slag, so that the molten bath formed when welding is protected, plays the role of self-shield；
(3) the preparation side of G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire of the present invention
Method is simple, easy to operate, can be used for mass production.
Specific implementation mode
The present invention is described in detail With reference to embodiment.
G520 stainless steels and 25Cr2Ni4MoV steel alloys of the present invention welding Self-protecting flux-cored wire, including medicine core and
Skin is welded, wherein medicine core is composed of the following components by mass percentage：Ferrosilicon powder 1%~4%, manganese powder 3%~5%, chromium powder 15%
~20%, nickel powder 12%~16%, copper powder 7%~9%, ferro-niobium powder 2%~5%, golden red mountain flour 8%~13%, Fluorspar Powder
13%~15%, zircon flour 6%~10%, lithium carbonate powder 4%~8%, brown iron oxide 3%~5%, alumina powder 3%~
5%, magnesia powder 4%~5%, remaining is iron powder, and the sum of the above components mass percent is 100%, wherein weldering Pi Weileng
Roll mild steel steel band, the loading of medicine core powder is 15wt%~20wt% in flux-cored wire.
The effect of each component and function are as follows in the flux-cored wire：
Silicon comes from the pig iron and deoxidier, and silicon deoxidizing capacity is stronger than manganese, is main deoxidier, can eliminate ferrous oxide and be mingled with
Harmful effect to steel.Silicon can act on ferrous oxide and form silica, be excluded subsequently into clinker.Silicon is in addition to shape
Other than being present in steel as impurity at silica, silicon is mainly dissolved in ferrite at room temperature, therefore silicon has by force steel
Change acts on.
Manganese is among the austenite stabilizing elements, and the addition of manganese can significantly reduce temperature of the austenite to ferritic transformation.Meanwhile
Manganese is with obvious effects in terms of reducing brittle transition temperature.Manganese also has certain deoxidization desulfuration effect, can be combined with oxygen and generate oxygen
Change manganese, and stable manganese sulfide can also be generated with reaction of Salmon-Saxl, the generation of low melting point phase iron sulfide in weld seam is reduced with this,
Improve the heat resistanceheat resistant crackle ability of weld metal.
Chromium is the element for promoting ferrite to form and stablize in deposited metal, adds chromium, is on the one hand to ensure weldering
The corrosion resistance for stitching metal, on the other hand also has certain effect to the raising of intensity.Studies have shown that on the basis of mild steel
It is upper that a certain amount of chromium is added, steel can be made to generate a kind of and matrix firm connection in the medium with oxidisability
The passivating film of ferrochrome oxide, and the pitting potential value of steel can be effectively improved, reduce sensibility of the steel to spot corrosion.Chromium is to intensity
Influence show as suitable chromium and can improve the obdurability of weld metal, but being excessively added with chromium content, some
The precipitation tendency of intermetallic compound gradually increases, their formation can significantly reduce the plasticity and toughness and corrosion resistance of steel with presence.
Nickel, which is one kind, to be completely dissolved in austenite, cooled welding in the infinitely widened element in austenitic area
The transition temperature that austenite can be reduced in journey may advantageously facilitate needle-shaped iron to inhibit the formation of blocky pro-eutectoid ferrite
The formation of ferritic, lower phase transition temperature is it is also ensured that uniformly tiny acicular ferrite is precipitated so that and welding seam toughness is good,
Therefore, austenite content can be promoted and improve weld metal toughness by Ni being added.
Copper is a kind of austenite former in common chromium nickel stainless steel, and the corrosion resistance of steel is improved, and is especially changed
It is apt to the corrosion resistance in reductant；But it is hard in martensitic precipitation that the addition of copper will make the hot-working character of steel become difficult
Change in stainless steel, the effect of copper mainly causes post-curing effect.
Niobium is the element to form strong carbide, niobium can form stable niobium carbide with carbon under high temperature, inhibits carbon with this
The formation for changing chromium, improves the various forms of corrosion resistances of stainless steel, can especially postpone sensitization time and improve weld metal and support
The performance of anti intercrystalline corrosion.Meanwhile niobium is also a kind of element forming precipitation-hardening phase, it can be with the chromium and nitrogen in weld metal
Etc. forming a kind of precipitation phase, precipitated phase is generated because of solution treatment, is had and is improved intensity and improve corrosion proof effect.Separately
Outside, the anti-tempered performance of niobium is preferable, and the increase of content of niobium causes the intensity of steel little with the variation range of temperature.
Rutile can make the characteristic of welding wire medicine core realization " short slag " during welding fusing, to weld seam molten metal
Sprawl highly beneficial, can play the role of stable electric arc, suitable rutile not only stabilising arc, but also reduce spatter,
It can also promote sprawling for molten pool metal, make appearance of weld well to reduce the formation of stomata in weld seam.
Fluorite is a kind of important materials of hydrogen controlled electrode, and main function is slag making, and in basic slag, it can reduce slag
Fusing point, viscosity and surface tension increase the mobility of slag, it is possible to reduce the gaseous impurity in weld metal has certain go
Hydrogen acts on.
Lithium carbonate can play the role of stabilising arc in welding, can decompose to give off carbon dioxide gas at high temperature, can completely cut off
Air prevents the generation of stomata, lithium carbonate from playing a protective role to weld seam.Lithium carbonate is stronger to the binding ability of sulphur, phosphorus, can be with
Effectively reduce sulphur in weld metal, phosphorus content.
The main function of zircon sand is to improve removability of slag energy, and the main component of zircon sand is zirconium dioxide and silica,
Wherein zirconium dioxide is the main component of slag making, while can adjust the physical property of slag, improves the removability of slag.If matching content
Very little effect for not having the improvement removability of slag has bulky grain molten drop and produces in the welding process when proportioning content is excessive,
Larger splashing is will produce, and molten bath further becomes excessive, is unfavorable for all-position welding.
Iron oxide is very important a kind of component in self-protection flux-cored wire slag system, can improve the surface of slag
Power keeps face of weld bright and clean.But the addition of iron oxide equally can generate harmful effect to the performance of self-protection flux-cored wire,
So the content of iron oxide is unsuitable excessively high；
It also needs that a small amount of aluminium oxide and magnesia is added in medicine core.Aluminium oxide is used for adjusting the viscosity of slag, ensures weld seam
Surface quality；Magnesia can adjust slag basicity, ensure the degree of purity of weld metal and improve the removability of slag.
The preparation method of G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire is specific to walk
It is rapid as follows：
Step 1 weighs respectively by mass percentage：Ferrosilicon powder 1%~4%, manganese powder 3%~5%, chromium powder 15%~
20%, nickel powder 12%~16%, copper powder 7%~9%, ferro-niobium powder 2%~5%, golden red mountain flour 8%~13%, Fluorspar Powder 13%
~15%, zircon flour 6%~10%, lithium carbonate powder 4%~8%, brown iron oxide 3%~5%, alumina powder 3%~5%,
Magnesia powder 4%~5%, remaining is iron powder, and the sum of the above components mass percent is 100%；
Step 2, the lithium carbonate powder that step 1 is weighed, brown iron oxide, alumina powder and magnesia powder mixing, are mixed
Sodium silicate binder is added into mixed powder A and is uniformly mixed, the mass ratio of mixed powder A and sodium silicate binder by medicinal powder A
It is 5:1, it is then placed into heating furnace, after being sintered 4~6h at 650 DEG C~750 DEG C, pulverizes, crosses 60~140 mesh screens, obtain
To mixed powder B；
Step 3, the ferrosilicon powder for weighing step 1, manganese powder, chromium powder, nickel powder, copper powder, ferro-niobium powder, golden red mountain flour, Fluorspar Powder,
Zircon flour and iron powder are uniformly mixed, and obtain mixed powder C, the mixed powder B that step 2 obtains is mixed with mixed powder C
It is even, it is placed in drying oven, 2h~3h is dried at 200 DEG C~300 DEG C, obtains medicine core powder；
The medicine core powder that step 3 obtains is wrapped in width as 7mm by step 4 by flux-cored wire producing machine, and thickness is
In the cold-rolled low carbon steel steel band of 0.3mm, the loading of medicine core powder is 15wt%~20wt%, and uses molding machine by cold rolling
Mild steel steel band is closed, and is obtained flux-cored wire semi-finished product, with acetone by cold-rolled low carbon steel steel band wiped clean, is then carried out first
Road drawing procedure, 2.8mm is in the grinding tool aperture that first of drawing procedure uses；
After step 5, first of drawing procedure, reduces drawing grinding tool aperture and carry out postorder drawing, until flux-cored wire
A diameter of 1.2mm~1.6mm；
After step 6, flux-cored wire drawing, the greasy dirt on flux-cored wire surface is removed with the cotton for being moistened with acetone, is obtained
G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire, stretched obtained welding wire with wire drawing machine,
It is wrapped on wire reel, packs for use.
Embodiment 1
The preparation method of G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire is specific to walk
It is rapid as follows：
Step 1 weighs respectively by mass percentage：Ferrosilicon powder 2%, manganese powder 5%, chromium powder 16%, nickel powder 12%, copper powder
8%, ferro-niobium powder 4%, golden red mountain flour 10%, Fluorspar Powder 13%, zircon flour 9%, lithium carbonate powder 6%, brown iron oxide 4%, oxygen
Change aluminium powder 4%, magnesia powder 4%, remaining is iron powder, and the sum of the above components mass percent is 100%；
Step 2, the lithium carbonate powder that step 1 is weighed, brown iron oxide, alumina powder and magnesia powder mixing, are mixed
Sodium silicate binder is added into mixed powder A and is uniformly mixed, the mass ratio of mixed powder A and sodium silicate binder by medicinal powder A
It is 5:1, it is then placed into heating furnace, after being sintered 5h at 650 DEG C, pulverizes, crosses 60~140 mesh screens, obtain mixed powder
B；
Step 3, the ferrosilicon powder for weighing step 1, manganese powder, chromium powder, nickel powder, copper powder, ferro-niobium powder, golden red mountain flour, Fluorspar Powder,
Zircon flour and iron powder are uniformly mixed, and obtain mixed powder C, the mixed powder B that step 2 obtains is mixed with mixed powder C
It is even, it is placed in drying oven, 2.5h is dried at 200 DEG C, obtain medicine core powder；
Step 4, by width be 7mm, the cold-rolled low carbon steel steel band that thickness is 0.3mm is placed on welding wire molding machine puts band machine
On, stainless steel belt is rolled by U-type groove by the indent of molding machine, the medicine core powder that step 3 obtains is put into U-type groove,
The filling rate of medicine core powder is controlled in 15wt%, then so that U-type groove is rolled closure with molding machine, with acetone by cold-rolled low carbon steel steel
First of drawing procedure is carried out after band wiped clean, 2.8mm is in the grinding tool aperture that first of drawing procedure uses；
After step 5, first of drawing procedure, reduces drawing grinding tool aperture and carry out postorder drawing, until flux-cored wire
A diameter of 1.2mm；
After step 6, flux-cored wire drawing, the greasy dirt on flux-cored wire surface is removed with the cotton for being moistened with acetone, is obtained
G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire, stretched obtained welding wire with wire drawing machine,
It is wrapped on wire reel, packs for use.
Flux-cored wire made from embodiment 1 is suitable for flux cored wire arc welding (FCAW-S), is not necessarily to additional protective gas, weldering
Narrow bars part is：Welding current is 150~180A, and weldingvoltage is 15.5~24.5V.After tested, the tensile strength of welding point
For 838Mpa, yield limit 675Mpa, the contraction percentage of area 54%, ballistic work 68J, performance meet G520 stainless steels and
The requirement of 25Cr2Ni4MoV steel alloy different steel welds.
Embodiment 2
The preparation method of G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire is specific to walk
It is rapid as follows：
Step 1 weighs respectively by mass percentage：Ferrosilicon powder 4%, manganese powder 3%, chromium powder 17%, nickel powder 13%, copper powder
7%, ferro-niobium powder 3%, golden red mountain flour 8%, Fluorspar Powder 14%, zircon flour 10%, lithium carbonate powder 5%, brown iron oxide 4%, oxygen
Change aluminium powder 5%, magnesia powder 5%, remaining is iron powder, and the sum of the above components mass percent is 100%；
Step 2, the lithium carbonate powder that step 1 is weighed, brown iron oxide, alumina powder and magnesia powder mixing, are mixed
Sodium silicate binder is added into mixed powder A and is uniformly mixed, the mass ratio of mixed powder A and sodium silicate binder by medicinal powder A
It is 5:1, it is then placed into heating furnace, after being sintered 4h at 700 DEG C, pulverizes, crosses 60~140 mesh screens, obtain mixed powder
B；
Step 3, the ferrosilicon powder for weighing step 1, manganese powder, chromium powder, nickel powder, copper powder, ferro-niobium powder, golden red mountain flour, Fluorspar Powder,
Zircon flour and iron powder are uniformly mixed, and obtain mixed powder C, the mixed powder B that step 2 obtains is mixed with mixed powder C
It is even, it is placed in drying oven, 2h is dried at 300 DEG C, obtains medicine core powder；
Step 4, by width be 7mm, the cold-rolled low carbon steel steel band that thickness is 0.3mm is placed on welding wire molding machine puts band machine
On, stainless steel belt is rolled by U-type groove by the indent of molding machine, the medicine core powder that step 3 obtains is put into U-type groove,
The filling rate of medicine core powder is controlled in 17wt%, then so that U-type groove is rolled closure with molding machine, with acetone by cold-rolled low carbon steel steel
First of drawing procedure is carried out after band wiped clean, 2.8mm is in the grinding tool aperture that first of drawing procedure uses；
After step 5, first of drawing procedure, reduces drawing grinding tool aperture and carry out postorder drawing, until flux-cored wire
A diameter of 1.4mm；
After step 6, flux-cored wire drawing, the greasy dirt on flux-cored wire surface is removed with the cotton for being moistened with acetone, is obtained
G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire, stretched obtained welding wire with wire drawing machine,
It is wrapped on wire reel, packs for use.
Flux-cored wire made from embodiment 2 is suitable for flux cored wire arc welding (FCAW-S), is not necessarily to additional protective gas, weldering
Narrow bars part is：Welding current is 140~180A, and weldingvoltage is 15.5~24.5V.After tested, the tensile strength of welding point
For 838Mpa, yield limit 689Mpa, the contraction percentage of area 51%, ballistic work 53J, performance meet G520 stainless steels and
The requirement of 25Cr2Ni4MoV steel alloy different steel welds.
Embodiment 3
The preparation method of G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire is specific to walk
It is rapid as follows：
Step 1 weighs respectively by mass percentage：Ferrosilicon powder 3%, manganese powder 4%, chromium powder 20%, nickel powder 16%, copper powder
7%, ferro-niobium powder 2%, golden red mountain flour 9%, Fluorspar Powder 13%, zircon flour 6%, lithium carbonate powder 4%, brown iron oxide 5%, oxidation
Aluminium powder 4%, magnesia powder 4%, remaining is iron powder, and the sum of the above components mass percent is 100%；
Step 2, the lithium carbonate powder that step 1 is weighed, brown iron oxide, alumina powder and magnesia powder mixing, are mixed
Sodium silicate binder is added into mixed powder A and is uniformly mixed, the mass ratio of mixed powder A and sodium silicate binder by medicinal powder A
It is 5:1, it is then placed into heating furnace, after being sintered 6h at 750 DEG C, pulverizes, crosses 60~140 mesh screens, obtain mixed powder
B；
Step 3, the ferrosilicon powder for weighing step 1, manganese powder, chromium powder, nickel powder, copper powder, ferro-niobium powder, golden red mountain flour, Fluorspar Powder,
Zircon flour and iron powder are uniformly mixed, and obtain mixed powder C, the mixed powder B that step 2 obtains is mixed with mixed powder C
It is even, it is placed in drying oven, 2h is dried at 250 DEG C, obtain medicine core powder；
Step 4, by width be 7mm, the cold-rolled low carbon steel steel band that thickness is 0.3mm is placed on welding wire molding machine puts band machine
On, stainless steel belt is rolled by U-type groove by the indent of molding machine, the medicine core powder that step 3 obtains is put into U-type groove,
The filling rate of medicine core powder is controlled in 20wt%, then so that U-type groove is rolled closure with molding machine, with acetone by cold-rolled low carbon steel steel
First of drawing procedure is carried out after band wiped clean, 2.8mm is in the grinding tool aperture that first of drawing procedure uses；
After step 5, first of drawing procedure, reduces drawing grinding tool aperture and carry out postorder drawing, until flux-cored wire
A diameter of 1.6mm；
After step 6, flux-cored wire drawing, the greasy dirt on flux-cored wire surface is removed with the cotton for being moistened with acetone, is obtained
G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire, stretched obtained welding wire with wire drawing machine,
It is wrapped on wire reel, packs for use.
Flux-cored wire made from embodiment 3 is suitable for flux cored wire arc welding (FCAW-S), is not necessarily to additional protective gas, weldering
Narrow bars part is：Welding current is 140~180A, and weldingvoltage is 15.5~24.5V.After tested, the tensile strength of welding point
For 867Mpa, yield limit 688Mpa, the contraction percentage of area 50%, ballistic work 49J, performance meet G520 stainless steels and
The requirement of 25Cr2Ni4MoV steel alloy different steel welds.
Embodiment 4
The preparation method of G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire is specific to walk
It is rapid as follows：
Step 1 weighs respectively by mass percentage：Ferrosilicon powder 1%, manganese powder 3%, chromium powder 15%, nickel powder 15%, copper powder
9%, ferro-niobium powder 5%, golden red mountain flour 11%, Fluorspar Powder 15%, zircon flour 8%, lithium carbonate powder 7%, brown iron oxide 3%, oxygen
Change aluminium powder 3%, magnesia powder 4%, remaining is iron powder, and the sum of the above components mass percent is 100%；
Step 2, the lithium carbonate powder that step 1 is weighed, brown iron oxide, alumina powder and magnesia powder mixing, are mixed
Sodium silicate binder is added into mixed powder A and is uniformly mixed, the mass ratio of mixed powder A and sodium silicate binder by medicinal powder A
It is 5:1, it is then placed into heating furnace, after being sintered 5h at 700 DEG C, pulverizes, crosses 60~140 mesh screens, obtain mixed powder
B；
Step 3, the ferrosilicon powder for weighing step 1, manganese powder, chromium powder, nickel powder, copper powder, ferro-niobium powder, golden red mountain flour, Fluorspar Powder,
Zircon flour and iron powder are uniformly mixed, and obtain mixed powder C, the mixed powder B that step 2 obtains is mixed with mixed powder C
It is even, it is placed in drying oven, 2.5h is dried at 300 DEG C, obtain medicine core powder；
Step 4, by width be 7mm, the cold-rolled low carbon steel steel band that thickness is 0.3mm is placed on welding wire molding machine puts band machine
On, stainless steel belt is rolled by U-type groove by the indent of molding machine, the medicine core powder that step 3 obtains is put into U-type groove,
The filling rate of medicine core powder is controlled in 19wt%, then so that U-type groove is rolled closure with molding machine, with acetone by cold-rolled low carbon steel steel
First of drawing procedure is carried out after band wiped clean, 2.8mm is in the grinding tool aperture that first of drawing procedure uses；
After step 5, first of drawing procedure, reduces drawing grinding tool aperture and carry out postorder drawing, until flux-cored wire
A diameter of 1.4mm；
After step 6, flux-cored wire drawing, the greasy dirt on flux-cored wire surface is removed with the cotton for being moistened with acetone, is obtained
G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire, stretched obtained welding wire with wire drawing machine,
It is wrapped on wire reel, packs for use.
Flux-cored wire made from embodiment 4 is suitable for flux cored wire arc welding (FCAW-S), is not necessarily to additional protective gas, weldering
Narrow bars part is：Welding current is 140~180A, and weldingvoltage is 15.5~24.5V.After tested, the tensile strength of welding point
For 856Mpa, yield limit 692Mpa, the contraction percentage of area 48%, ballistic work 58J, performance meet G520 stainless steels and
The requirement of 25Cr2Ni4MoV steel alloy different steel welds.
Embodiment 5
The preparation method of G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire is specific to walk
It is rapid as follows：
Step 1 weighs respectively by mass percentage：Ferrosilicon powder 2%, manganese powder 4%, chromium powder 18%, nickel powder 12%, copper powder
7%, ferro-niobium powder 2%, golden red mountain flour 13%, Fluorspar Powder 13%, zircon flour 7%, lithium carbonate powder 8%, brown iron oxide 3%, oxygen
Change aluminium powder 3%, magnesia powder 4%, remaining is iron powder, and the sum of the above components mass percent is 100%；
Step 2, the lithium carbonate powder that step 1 is weighed, brown iron oxide, alumina powder and magnesia powder mixing, are mixed
Sodium silicate binder is added into mixed powder A and is uniformly mixed, the mass ratio of mixed powder A and sodium silicate binder by medicinal powder A
It is 5:1, it is then placed into heating furnace, after being sintered 4h at 650 DEG C, pulverizes, crosses 60~140 mesh screens, obtain mixed powder
B；
Step 3, the ferrosilicon powder for weighing step 1, manganese powder, chromium powder, nickel powder, copper powder, ferro-niobium powder, golden red mountain flour, Fluorspar Powder,
Zircon flour and iron powder are uniformly mixed, and obtain mixed powder C, the mixed powder B that step 2 obtains is mixed with mixed powder C
It is even, it is placed in drying oven, 3h is dried at 200 DEG C, obtain medicine core powder；
Step 4, by width be 7mm, the cold-rolled low carbon steel steel band that thickness is 0.3mm is placed on welding wire molding machine puts band machine
On, stainless steel belt is rolled by U-type groove by the indent of molding machine, the medicine core powder that step 3 obtains is put into U-type groove,
The filling rate of medicine core powder is controlled in 16wt%, then so that U-type groove is rolled closure with molding machine, with acetone by cold-rolled low carbon steel steel
First of drawing procedure is carried out after band wiped clean, 2.8mm is in the grinding tool aperture that first of drawing procedure uses；
After step 5, first of drawing procedure, reduces drawing grinding tool aperture and carry out postorder drawing, until flux-cored wire
A diameter of 1.4mm；
After step 6, flux-cored wire drawing, the greasy dirt on flux-cored wire surface is removed with the cotton for being moistened with acetone, is obtained
G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire, stretched obtained welding wire with wire drawing machine,
It is wrapped on wire reel, packs for use.
Flux-cored wire made from embodiment 5 is suitable for flux cored wire arc welding (FCAW-S), is not necessarily to additional protective gas, weldering
Narrow bars part is：Welding current is 160~180A, and weldingvoltage is 16.5~24.5V.After tested, the tensile strength of welding point
For 965Mpa, yield limit 830Mpa, the contraction percentage of area 52%, ballistic work 55J, performance meet G520 stainless steels and
The requirement of 25Cr2Ni4MoV steel alloy different steel welds.
Flux-cored wire prepared by the present invention is compared with rust steel electrode and solid welding wire, the few, appearance of weld with spatter
The advantages of beauty, good welds processing performance；It can be used for continuous wire feed automatic welder, there is higher production efficiency and save and protect
Protect gas；Slag is generated using mineral slag system, so that the molten bath formed when welding is protected, plays the role of self-shield；System
Preparation Method is simple, easy to operate, can be used for mass production.
Claims (9)
1.G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire, which is characterized in that including medicine core
With weldering skin, wherein medicine core is composed of the following components by mass percentage：Ferrosilicon powder 1%~4%, manganese powder 3%~5%, chromium powder
15%~20%, nickel powder 12%~16%, copper powder 7%~9%, ferro-niobium powder 2%~5%, golden red mountain flour 8%~13%, fluorite
Powder 13%~15%, zircon flour 6%~10%, lithium carbonate powder 4%~8%, brown iron oxide 3%~5%, alumina powder 3%
~5%, magnesia powder 4%~5%, remaining is iron powder, and the sum of the above components mass percent is 100%.
2. G520 stainless steels according to claim 1 and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire,
It is characterized in that, the weldering skin is cold-rolled low carbon steel steel band.
3. G520 stainless steels according to claim 1 and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire,
It is characterized in that, the loading of medicine core powder is 15wt%~20wt% in the flux-cored wire.
4. preparing such as claims 1 to 3 any one of them G520 stainless steels and 25Cr2Ni4MoV steel alloy welding self-shields
The method of type flux-cored wire, which is characterized in that be as follows：
Step 1 weighs respectively by mass percentage：Ferrosilicon powder 1%~4%, manganese powder 3%~5%, chromium powder 15%~20%, nickel
Powder 12%~16%, copper powder 7%~9%, ferro-niobium powder 2%~5%, golden red mountain flour 8%~13%, Fluorspar Powder 13%~15%,
Zircon flour 6%~10%, lithium carbonate powder 4%~8%, brown iron oxide 3%~5%, alumina powder 3%~5%, magnesia powder
4%~5%, remaining is iron powder, and the sum of the above components mass percent is 100%；
Step 2, the lithium carbonate powder that step 1 is weighed, brown iron oxide, alumina powder and magnesia powder mixing, obtain mixed powder
Sodium silicate binder is added into mixed powder A and is uniformly mixed, is then placed into heating furnace and is sintered, pulverize, be sieved, obtain by A
To mixed powder B；
Step 3, the ferrosilicon powder that step 1 is weighed, manganese powder, chromium powder, nickel powder, copper powder, ferro-niobium powder, golden red mountain flour, Fluorspar Powder, zirconium English
Emery dust and iron powder are uniformly mixed, and obtain mixed powder C, the mixed powder B that step 2 obtains is uniformly mixed with mixed powder C, is set
It is dried in drying oven, obtains medicine core powder；
Step 4, by flux-cored wire producing machine the medicine core powder that step 3 obtains be wrapped in weldering it is intradermal, and using molding machine will
It welds skin to be closed, obtains flux-cored wire semi-finished product, will weld skin wiped clean with acetone, and then carry out first of drawing procedure, first
2.8mm is in the grinding tool aperture that road drawing procedure uses；
After step 5, first of drawing procedure, reduce drawing grinding tool aperture and carry out postorder drawing, until flux-cored wire is straight
Diameter is 1.2mm~1.6mm；
After step 6, flux-cored wire drawing, the greasy dirt on flux-cored wire surface is removed with the cotton for being moistened with acetone, obtains G520
Stainless steel and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire.
5. G520 stainless steels according to claim 4 and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire
Preparation method, which is characterized in that in the step 2 mass ratio of mixed powder A and sodium silicate binder be 5:1.
6. G520 stainless steels according to claim 4 and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire
Preparation method, which is characterized in that in the step 2 sintering temperature be 650 DEG C~750 DEG C, sintering time be 4~6h, sieving
Granularity is 60~140 mesh.
7. G520 stainless steels according to claim 4 and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire
Preparation method, which is characterized in that in the step 3 drying temperature be 200 DEG C~300 DEG C, drying time be 2h~3h.
8. G520 stainless steels according to claim 4 and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire
Preparation method, which is characterized in that weldering skin in the step 4 is cold-rolled low carbon steel steel band, and the width of steel band is 7mm, thickness
For 0.3mm.
9. G520 stainless steels according to claim 4 and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire
Preparation method, which is characterized in that in the step 4 in flux-cored wire medicine core powder loading be 15wt%~20wt%.
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| CN201810218619.8A CN108356447A (en) | 2018-03-16 | 2018-03-16 | G520 stainless steels and 25Cr2Ni4MoV steel alloys welding Self-protecting flux-cored wire and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109317862A (en) * | 2018-11-12 | 2019-02-12 | 西安理工大学 | 25CrNiMoV gas shielded type flux-cored wire and preparation method thereof |
| CN110587179A (en) * | 2019-09-03 | 2019-12-20 | 西安理工大学 | Self-protection flux-cored wire for welding T2 copper and 304 stainless steel and preparation method thereof |
| CN111172375A (en) * | 2020-01-17 | 2020-05-19 | 西安理工大学 | Heat treatment method for improving fan impeller strength |
| CN111644780A (en) * | 2019-12-11 | 2020-09-11 | 江苏科技大学 | Self-protection flux-cored wire for generating slag coating with special protection performance and preparation method |
| CN113695786A (en) * | 2021-10-27 | 2021-11-26 | 张家港市亨昌焊材有限公司 | Component of flux-cored wire for weathering resistant steel and preparation method thereof |
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2018
- 2018-03-16 CN CN201810218619.8A patent/CN108356447A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109317862A (en) * | 2018-11-12 | 2019-02-12 | 西安理工大学 | 25CrNiMoV gas shielded type flux-cored wire and preparation method thereof |
| CN110587179A (en) * | 2019-09-03 | 2019-12-20 | 西安理工大学 | Self-protection flux-cored wire for welding T2 copper and 304 stainless steel and preparation method thereof |
| CN110587179B (en) * | 2019-09-03 | 2021-11-16 | 西安理工大学 | Self-protection flux-cored wire for welding T2 copper and 304 stainless steel and preparation method thereof |
| CN111644780A (en) * | 2019-12-11 | 2020-09-11 | 江苏科技大学 | Self-protection flux-cored wire for generating slag coating with special protection performance and preparation method |
| US11534873B2 (en) | 2019-12-11 | 2022-12-27 | Hefei University Of Technology | Self-shielded flux-cored welding wire with special protective slag coating formed in situ and manufacture method thereof |
| CN111172375A (en) * | 2020-01-17 | 2020-05-19 | 西安理工大学 | Heat treatment method for improving fan impeller strength |
| CN113695786A (en) * | 2021-10-27 | 2021-11-26 | 张家港市亨昌焊材有限公司 | Component of flux-cored wire for weathering resistant steel and preparation method thereof |
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Application publication date: 20180803 |